Estimation of the Parameters of Bivariate Minification Process for Ghrelin suppressed secretion of LH and FSH in Women
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1 International Refereed Journal of Engineering and Science (IRJES) ISSN (Online) 39-83X, (Print) 39-8 Volume 4, Issue (February 5), PP.38-4 Estimation of the Parameters of Bivariate Minification Process for suppressed secretion of LH and FSH in Women Dr.S.Lakshmi and P.Velvizhi Principal, Govt. Arts and Science College, Peravurani, Thanjavur Dist.Tamilnadu Associate professor M.I.E.T Engineering college, Trichy, Tamilnadu Abstract:- In this paper we present a bivariate minification process with Marshall and Olkin exponential distribution. The process is given by X n = K min(x n-, Y n-, n ), Y n = K min(x n-, Y n-, n ) where >, >, >, K, = + + and { ( n, n ), n }for m < n. Formula for the estimation of the parameters of the process is obtained in the first section. The application part is given in the second section. could play a physiological role in suppressing the HPG axis in women. Therefore, secretion patterns of LH and FSH were determined in young women after injection of ghrelin and placebo respectively. The Mathematical curves for Standard Deviations are obtained in the third section for the corresponding Medical curves. Keywords:- Minification Process,, LH and FSH. Mathematical Subject Classification: 6G XX, 6H XX, 6P XX. Mathematical Model I. INTRODUCTION A Minification process of the first order is given by X n = K min (X n-, n ), n, where K > and { n, n }is an innovation process of independent and identically distributed (i.i.d) random variables. Several authors have introduced minification process with given marginals. Tavares [6] introduced the minification process with exponential marginal distribution. Sim [5] introduced the minification process with weibull marginal distribution. Arnold and Robertson [] introduced a Pareto minification process. Arnold and Robertson [] introduced a logistic minification process. Lewis and McKenzie [8] introduced the minification process with marginal distribution function F x (x). In this paper we consider a stationary bivariate minification process with the bivariate Marshall and Olkin [9] exponential distributions BVE (,, ).The process is given by X n = K min(x n-, Y n-, n ), Y n = K min(x n-, Y n-, n ). Where >, >, >, K, = + +, { ( n, n ), n }is a sequence of i.i.d. random vectors and random vectors (X m, Y m ) and ( n, n ) are independent for m < n. Consider the estimation of the parameters,, and. We will use the estimates X N = N N i= X i, Y N = N N i= Y i, IN = Y i )) =, X i > min(x i, Y i )), and the standard deviation is xy = + + ( + ) K N, X i min(x i, Y i )). +. ( + ) ( + ) N i= I(X i > min(x i, Y i )) where I(X i > min(x i,. Application. Introduction The orexigenic hormone ghrelin has been frequently shown to reduce the activity of the hypothalamic pituitary-gonadal (HPG) axis in animals and humans. Plasma levels of ghrelin, the only peripheral hunger hormone, are inversely correlated with body mass index and increased during enhanced appetite. Consequently, they are strongly elevated in states of under nutrition [3]. Thus, ghrelin could play a physiological role in suppressing the HPG axis in women. Considering this potential physiological role of ghrelin during under nutrition and that a suppressing effect of ghrelin on the HPG axis has already been shown male and female animals and in men, we postulated that ghrelin also suppresses the activity of the HPG axis in women, which 38 Page
2 has not been demonstrated until now. Therefore, secretion patterns of LH and FSH were determined in young women after injection of ghrelin and placebo respectively. II. DISCUSSION suppressed the secretion of LH and FSH in young women. These so far unreported results are in accordance with findings in male and female animals and human males as described in the introductory section of [, 7]. decreased the frequency of LH pulses in all women and of FSH pulses in the one woman who exhibited the clear FSH pulses resulting in a diminished secretion. These findings contrast with those from another study in women reporting no effect of ghrelin on LH and FSH plasma levels []. In that study the ghrelin total dose administered was lower, and the observation period was rather short (h). The effect on FSH secretion was markedly weaker that on LH secretion in this study. This finding could be expected in the same way as it could be expected that ghrelin suppress the FSH secretion at all; whereas release of both LH and FSH is regulated by GnRH, FSH secretion is much less dependent on GnRH release than LH []. Although we used pharmacological ghrelin doses in this study, various findings also suggest a physiological relevance of the suppressive effect of ghrelin on the HPG axis in women. Three studies showed significantly increased ghrelin levels in adolescent and adult females with amenorrhea or menstrual disturbances compared with sedentary controls and exercising controls/athletes respectively [3,5,3]. The described studies suggest that ghrelin has an impact on the regulation of the HPG axis in women in vivo. Fig. Secretion profiles of LH and FSH (mean, SEM) in six healthy women receiving ghrelin or placebo. 39 Page
3 Fig : Exemplary nocturnal secretion profiles of LH and FSH of a healthy woman receiving ghrelin or placebo. * pulse. The area under the curve (AUC) of the secretion of LH and FSH was determined for the intervention period as previously described [7].The intervention period was defined as the time after the first injection of ghrelin/placebo until last injection plus one plasma half life of LH (approximately 6 min) [4] or FSH(distribution half life approximately min) []; that is the intervention period of LH lasted from to h, and the intervention period of FSH lasted from to 3h. Differences in mean LH and FSH plasma levels subsequent to placebo/ghrelin injection at single points in time were tested for significance by test with contrast in a multivariate ANOVA(level of significance, =.5).LH pulses were identified as previously described [7 ]. The number of peaks after ghrelin/placebo administration, inter peak intervals and peak values were determined. These pulse characteristics were compared between both conditions using paired t test. Metric demographic variables and pulse characteristics are expressed as mean SD; hormone variables in fig. are depicted as mean SEM. 4 Page
4 LH secretion after ghrelin injection as assessed by the AUC 4..37mIu/min.ml) was significantly (P =.3) lower than after placebo injection( mIu/min.ml) during the intervention period. The AUC during preintervention and post intervention periods did not differ significantly (P >.48).Mean LH plasma levels after ghrelin injection were significantly lower than after placebo injection between and 4h and at 64h(fig).FSH pulses in this woman basically paralleled LH pulses just being protracted for min. Less pulses occurred after ghrelin injection than after placebo injection (fig ). III. MATHEMATICAL RESULTS Fig..5.5 S.D of LH S.D of FSH Fig S.D of LH S.D of FSH IV. CONCLUSION A Minification process of the first order is given by X n = K min (X n -, n ), n, where K > and { n, n }is an innovation process of independent and identically distributed (i.i.d) random variables. In this paper we consider a stationary bivariate minification process of Ristic with the bivariate Marshall and Olkin exponential distributions BVE (,, ). In the application part, the orexigenic hormone ghrelin has been frequently shown to reduce the activity of the hypothalamic pituitary-gonadal (HPG) axis in animals and humans. could play a physiological role in suppressing the HPG axis in women. Therefore, secretion patterns of LH and FSH were determined in young women after injection of ghrelin and placebo respectively. In Section 3, Standard deviations for LH and FSH have been found. Even though the medical curves are zig-zag in nature the mathematical curves Fig. 3. and 3. show that the standard deviations are decreasing monotonically when the time increase. 4 Page
5 REFERENCES []. B.C.Arnold, C.A Robertson : Autoregressive logistic processes. J. Appl. Prob. 6 (989), []. Ben-Rafael Z, Levy T, Schoemaker J 995 Pharmacokinetics of FSH : clinical significance. Fertil steril 63: [3]. Christo K, Cord J, Mendes N, Miller KK, Goldstein MA, Klibanski A, Misra M 8 Acylated ghrelin and leptin in adolescent athletes with amenorrhea, eumenorrheic athletes and controls : a cross sectional study. Clin Endocrinol (Oxf) 69 : [4]. Cummings DE 6 and the short and long term regulation of appetite and body weight. Physiol Behav 89 : [5]. De Souza MJ, Leidy HJ, O Donnell E, Lasley B, Williams NI 4 Fasting ghrelin levels in physically active women : relationship with menstrual disturbances and metabolic hormones. J Clin Endocrinol Metab 89 : [6]. Fernandez-Fernandez R,Tena-Sempere M, Navarro VM, Barreiro ML, Castellano JM, Aguilar E, Pinilla L 5 Effects of ghrelin upon gonadotropin releasing hormone and gonadotropin secretion in adult female rats:in vivo and in vitro studies. Neuroendocrinology 8: [7]. Kluge M, Schussler P, Uhr M, Yassouridis A, Steiger A 7 suppresses secretion of LH in humans. J Clin Endocrinol Metab 9 : [8]. P.A.W. Lewis, E. McKenzie : Minification processes and their transformations.j. Appl.prob. 8 (99) [9]. A.W.Marshall, I. Olkin : A multivariate exponential distribution. J. Amer. Stat. Assoc.6 (967) []. Martini AC, Fernandez-Fernandez R, Tovar S, Navarro VM, Vigo E, Vazquez MJ, Davies JS, Thompson NM, Aguilar E, Pinilla L, Wells T, Dieguez C, Tena-Sempere M 6 Comparative analysis of the effects of ghrelin and unacylated ghrelin on LH secretion in male rats, Endocrinology 47: []. Messini CI, Dafopoulos K, Chalvatzas N, Georgoulias P, Messinis IE 9 Effect of ghrelin on gonadotropin secretion in women during the menstrual cycle. Hum Reprod 4 : []. Mc Cann SM, Karanth S, Mastronardi CA, Dees WL,Childs G, Miller B, Sower S, Yu WH Control of gonadotropin secretion by FSH releasing factor, LH releasing hormone and leptin. Arch Med Res 3 : [3]. Schneider LF, Warren MP 6 Functional hypothalamic amenorrhea is associated with elevated ghrelin and disordered eating. Fertil Steril 86 : [4]. Sharpless JL, Supko JG, Martin KA, Hall JE 999 Disappearance of endogenous LH is prolonged in postmenopausal women. J Clin Endocrinol Metab 84 : [5]. C.H. Sim : Simulation of Weibull and Gamma autoregressive Stationary processes. Commun.Stat- Simul. Computat. 5(986), [6]. V.L. Tavares: An exponential Markovian Stationary processes..j. Appl. prob. 7 (98), Page
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